Today’s technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.
- small cars more fuel-efficient now than at any time in their
- small cars that are more fuel-efficient than they were at any time in their
- small cars that are more fuel-efficient than those at any other time in
- more fuel-efficient small cars than those at any other time in their
- more fuel-efficient small cars now than at any time in（Ｃ）
为什么Ｄ错的啊？ [em03][em03[em06] | 
